Method and apparatus for driving a stepping motor

Details Method and apparatus for driving a stepping motor Method and apparatus for driving a stepping motor

H - Electricity

02

P

318/18, 352/21.3

H02P 8/00 (2006.01) G11B 5/55 (2006.01) G11B 19/20 (2006.01) H02K 37/24 (2006.01) H02P 8/22 (2006.01)

Patent

CA 1318397

PATENT 39-0100.2134 ABSTRACT OF THE DISCLOSURE In driving a stepping motor which, for example, is used to effect tracking movements of a head in an electronic still camera or other magnetic disk recording and/or reproducing apparatus, and which has a rotor and a plurality of phases to which input pulses are applied in predetermined sequences for establishing excitation states by which the rotor is stepped to respective positions, the input pulses are controlled for alternating between first and second excitation states corresponding to adjacent stepped positions between which it is desired to bring the rotor to rest. Such alternation is initially effected at a relatively low frequency so that the rotor oscillates between the stepped positions corresponding to the first and second excitation states, respectively, and then the frequency of alternation between the first and second excitation states is gradually increased to a value at which the rotor no longer oscillates with such alternation and comes to rest at a position between the stepped positions. A duty ratio is selected for the first and second excitation states which inversely corresponds to the ratio of the distances from the desired position of rest of the rotor to the stepped positions of the latter corresponding to the first and second excitation states, respectively, and such duty ratio is applied to the alternation between the first and second excitation states at least during the increasing of the frequency of alternation to the value at which the rotor no longer oscillates. AS18:16mk -2-

594344

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